Storage tank exhaust gas
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I seek the expert’s advice: In pressure-rated storage tanks that share exhaust pipes, how can backflow be prevented? If a check valve is installed, will the exhaust gas be able to push past it successfully? Without a check valve, can a breathing valve serve as a check valve? Additionally, how many methods are there for treating exhaust gas from storage tanks? If you are aware of any, please let me know. Thank you very much!
Air leakage is almost inevitable; it depends on how much air leakage can be tolerated
Air leakage in atmospheric pressure storage tanks is inevitable; using nitrogen blanketing can resolve this issue
From a design perspective, check valves should not be considered an effective means of preventing gas leakage. Because the quality of the check valve is really poor. It’s actually quite difficult to completely prevent gas crossover in atmospheric pressure storage tanks, unless separate exhaust pipelines are installed. However, there are still many management methods to reduce the possibility of air leakage. As you mentioned, things like breather valves, step-controlled pressure regulation for the tanks, and nitrogen supplementation are all viable options. Additionally, even though they are all atmospheric-pressure storage tanks, it is still possible to set different pressures for them. For tanks with high concentration requirements, the operating pressure can be set a bit higher; for those with lower purity requirements, the pressure can be set lower. In this way, at least the tanks requiring high purity will not be affected.
Why didn’t my replies appear even though I posted them twice in this thread? ? ? ?
After various exhaust streams reach the main pipeline, there is a risk that the exhaust gases may spread around randomly, causing operational problems. By applying suction or pressure downstream, flow can be regulated to reduce the likelihood of interference between the exhaust gases. As for how to treat these exhaust gases, methods such as adsorption, condensation, and combustion can be used
As long as everything is connected to a single main pipe, air leakage will definitely occur. Some protective measures can be taken, such as installing flame arresters at the pipe ends, adding gas concentration analyzers, and increasing the airflow to dilute the concentration
Install a nitrogen-sealed vent valve; in cases where there are strict requirements to prevent exhaust gas from flowing back, the pressure inside the tank should be increased appropriately